<viaf ref="PlaceOfPublication">
<!-- # Format: 'mmmiis' -->
<!-- # mmm - MARC main field -->
<!-- # ii - indicator 1 + 2 (_ if empty) -->
<!-- # s - MARC subfield -->
<source>210__a; 111__a; 100__a; 110__a; 150__a; 151__a;</source>
<!-- # Format: 'mmmiis=label' -->
<!-- # mmm - MARC main field -->
<!-- # ii - indicator 1 + 2 (_ if empty) -->
<!-- # s - MARC subfield -->
<!-- # label - label of the field, can be used as message key -->
<field>001=NORM_IDENTIFIER; 0247_a=URI;</field>